monitoring of ON 231 during the great outburst in 1994-1997
monitoring of ON 231 during the great outburst in 1994-1997
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DOI：
10.1051/aas:1998215
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发表时间：
1998-05
期刊：
影响因子：
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通讯作者：
G. Tosti;M. Fiorucci;M. Luciani;N. Rizzi;M. Villata;C. Raiteri;G. D. Francesco;L. Lanteri;M. Chiaberge;A. Peila;M. Cavallone;G. Sobrito;M. Maesano;E. Massaro;F. Montagni;R. Nesci;G. Ghisellini;L. Takalo;A. Sillanpää;S. Katajainen;P. Heinämäki;K. Nilsson;T. Pursimo
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文献类型：
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作者：
G. Tosti;M. Fiorucci;M. Luciani;N. Rizzi;M. Villata;C. Raiteri;G. D. Francesco;L. Lanteri;M. Chiaberge;A. Peila;M. Cavallone;G. Sobrito;M. Maesano;E. Massaro;F. Montagni;R. Nesci;G. Ghisellini;L. Takalo;A. Sillanpää;S. Katajainen;P. Heinämäki;K. Nilsson;T. Pursimo
我们提出了最连续的数据库的光学多波段数据上发表的BL Lacertae对象ON 231（W COM）。这些数据是在1994年3月至1997年3月期间进行的密集和协调的BVRcIc监测活动中收集的。在我们的活动中，光源亮度达到了有史以来的最高水平。光变曲线显示了一个复杂的结构，其特征是在1995年3月、1996年2月和1997年1月ON 231达到其历史最大值（B' 14：2）时出现了三次观测到的最大爆发。从几小时到一个月的时间尺度上的变化经常被观察到，光变曲线似乎是许多具有不同振幅和时间尺度的耀斑的叠加。宽带光谱能量分布的特征在于与通量水平相关的光谱斜率。特别地，通量越高，光谱越平坦。
We present the most continuous data base of optical multiband data ever published on the BL Lacertae object ON 231 (W Com). The data have been collected during an intensive and coordinated BVRcIc monitoring campaign carried out in the period from March 1994 to March 1997. During our campaign, the source brightness was at the highest level ever observed. The light curve shows a complex structure, characterized by the pres- ence of three major outbursts having the observed max- ima in March 1995, February 1996, and January 1997, when ON 231 reached its historical maximum (B' 14:2). Variability on time scales from a few hours up to a month have frequently been observed and the light curve seems to be the superposition of many flares with dierent ampli- tudes and time scales. The broad-band optical spectral en- ergy distribution is characterized by a spectral slope which correlates with the flux level. In particular, the higher is the flux the flatter is the spectrum.